1 /* 2 * Device manager 3 * 4 * Copyright (c) 2014 Google, Inc 5 * 6 * (C) Copyright 2012 7 * Pavel Herrmann <morpheus.ibis@gmail.com> 8 * 9 * SPDX-License-Identifier: GPL-2.0+ 10 */ 11 12 #include <common.h> 13 #include <errno.h> 14 #include <malloc.h> 15 #include <dm/device.h> 16 #include <dm/device-internal.h> 17 #include <dm/uclass.h> 18 #include <dm/uclass-internal.h> 19 #include <dm/util.h> 20 21 /** 22 * device_chld_unbind() - Unbind all device's children from the device 23 * 24 * On error, the function continues to unbind all children, and reports the 25 * first error. 26 * 27 * @dev: The device that is to be stripped of its children 28 * @return 0 on success, -ve on error 29 */ 30 static int device_chld_unbind(struct udevice *dev) 31 { 32 struct udevice *pos, *n; 33 int ret, saved_ret = 0; 34 35 assert(dev); 36 37 list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) { 38 ret = device_unbind(pos); 39 if (ret && !saved_ret) 40 saved_ret = ret; 41 } 42 43 return saved_ret; 44 } 45 46 /** 47 * device_chld_remove() - Stop all device's children 48 * @dev: The device whose children are to be removed 49 * @return 0 on success, -ve on error 50 */ 51 static int device_chld_remove(struct udevice *dev) 52 { 53 struct udevice *pos, *n; 54 int ret; 55 56 assert(dev); 57 58 list_for_each_entry_safe(pos, n, &dev->child_head, sibling_node) { 59 ret = device_remove(pos); 60 if (ret) 61 return ret; 62 } 63 64 return 0; 65 } 66 67 int device_unbind(struct udevice *dev) 68 { 69 struct driver *drv; 70 int ret; 71 72 if (!dev) 73 return -EINVAL; 74 75 if (dev->flags & DM_FLAG_ACTIVATED) 76 return -EINVAL; 77 78 drv = dev->driver; 79 assert(drv); 80 81 if (drv->unbind) { 82 ret = drv->unbind(dev); 83 if (ret) 84 return ret; 85 } 86 87 ret = device_chld_unbind(dev); 88 if (ret) 89 return ret; 90 91 ret = uclass_unbind_device(dev); 92 if (ret) 93 return ret; 94 95 if (dev->parent) 96 list_del(&dev->sibling_node); 97 free(dev); 98 99 return 0; 100 } 101 102 /** 103 * device_free() - Free memory buffers allocated by a device 104 * @dev: Device that is to be started 105 */ 106 void device_free(struct udevice *dev) 107 { 108 int size; 109 110 if (dev->driver->priv_auto_alloc_size) { 111 free(dev->priv); 112 dev->priv = NULL; 113 } 114 if (dev->flags & DM_FLAG_ALLOC_PDATA) { 115 free(dev->platdata); 116 dev->platdata = NULL; 117 } 118 size = dev->uclass->uc_drv->per_device_auto_alloc_size; 119 if (size) { 120 free(dev->uclass_priv); 121 dev->uclass_priv = NULL; 122 } 123 if (dev->parent) { 124 size = dev->parent->driver->per_child_auto_alloc_size; 125 if (size) { 126 free(dev->parent_priv); 127 dev->parent_priv = NULL; 128 } 129 } 130 } 131 132 int device_remove(struct udevice *dev) 133 { 134 struct driver *drv; 135 int ret; 136 137 if (!dev) 138 return -EINVAL; 139 140 if (!(dev->flags & DM_FLAG_ACTIVATED)) 141 return 0; 142 143 drv = dev->driver; 144 assert(drv); 145 146 ret = uclass_pre_remove_device(dev); 147 if (ret) 148 return ret; 149 150 ret = device_chld_remove(dev); 151 if (ret) 152 goto err; 153 154 if (drv->remove) { 155 ret = drv->remove(dev); 156 if (ret) 157 goto err_remove; 158 } 159 160 if (dev->parent && dev->parent->driver->child_post_remove) { 161 ret = dev->parent->driver->child_post_remove(dev); 162 if (ret) { 163 dm_warn("%s: Device '%s' failed child_post_remove()", 164 __func__, dev->name); 165 } 166 } 167 168 device_free(dev); 169 170 dev->seq = -1; 171 dev->flags &= ~DM_FLAG_ACTIVATED; 172 173 return ret; 174 175 err_remove: 176 /* We can't put the children back */ 177 dm_warn("%s: Device '%s' failed to remove, but children are gone\n", 178 __func__, dev->name); 179 err: 180 ret = uclass_post_probe_device(dev); 181 if (ret) { 182 dm_warn("%s: Device '%s' failed to post_probe on error path\n", 183 __func__, dev->name); 184 } 185 186 return ret; 187 } 188